To get to the Great Temple? No other direct paths without trying to go through the water. I suppose your character can try looking for a boat or attempt swimming to the place if so desired.
As for paths and/or places aside from the temple, sure. If Pakiki decides to look around and go for some other location, I can give a description for it. If it helps, here is the map of Ga-Metru for reference. The Great Temple is the island off the right coast and above Ta-Metru.
And this very rough modification to the map below. The big circle on the left side of Ga-Metruās coast is roughly where the lighthouse is located. The line is generally where Pakiki and the rest of your group has traveled so far. And the other circle is the temple theyāre trying to reach via bridge.
Thatās actually a good idea. Spawner has been dealing with some things, but Iām sure his character wouldnāt mind if it was temporarily borrowed. Would make for a great light in general.